Spring 正在失去与数据库的连接并且不会恢复或重新连接
Spring is losing connection to the DB and does not recover or reconnect
我在与 Maria DB 相同的主机上有一个 spring-boot 应用程序，两者都 运行 一段时间没问题。但是在 12 小时到 2 天之间，spring 启动应用程序似乎失去了与数据库（堆栈跟踪）的连接并且无法从中恢复。
当我重新启动 spring 应用程序时，一段时间内一切正常。
应用程序没有负载，当它失去连接时，应用程序仍在工作，但数据库连接没有恢复。数据库没有同时重启（正常运行时间 4 周）。只有监控服务每分钟 ping 一次 ping 数据库的应用程序。 （spring 启动运行状况）
连接到同一数据库的其他 Java 应用程序 运行 正常，没有任何问题。
我的问题是：
为什么 spring 没有从该错误中恢复并再次尝试重新连接到数据库？如何设置 spring 以重新连接到数据库？
2015-02-19 15:25:48.392 INFO 4931 [qtp92662861-19] --- o.s.b.f.xml.XmlBeanDefinitionReader : Loading XML bean definitions from class path resource [org/springframework/jdbc/support/sql-error-codes.xml]
2015-02-19 15:25:48.580 INFO 4931 [qtp92662861-19] --- o.s.jdbc.support.SQLErrorCodesFactory : SQLErrorCodes loaded: [DB2, Derby, H2, HSQL, Informix, MS-SQL, MySQL, Oracle, PostgreSQL, Sybase]
2015-02-19 15:25:48.616 WARN 4931 [qtp92662861-19] --- o.s.jdbc.support.SQLErrorCodesFactory : Error while extracting database product name - falling back to empty error codes
org.springframework.jdbc.support.MetaDataAccessException: Error while extracting DatabaseMetaData; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: No operations allowed after connection closed.
at org.springframework.jdbc.support.JdbcUtils.extractDatabaseMetaData(JdbcUtils.java:296)
at org.springframework.jdbc.support.JdbcUtils.extractDatabaseMetaData(JdbcUtils.java:320)
at org.springframework.jdbc.support.SQLErrorCodesFactory.getErrorCodes(SQLErrorCodesFactory.java:214)
at org.springframework.jdbc.support.SQLErrorCodeSQLExceptionTranslator.setDataSource(SQLErrorCodeSQLExceptionTranslator.java:134)
at org.springframework.jdbc.support.SQLErrorCodeSQLExceptionTranslator.<init>(SQLErrorCodeSQLExceptionTranslator.java:97)
at org.springframework.jdbc.support.JdbcAccessor.getExceptionTranslator(JdbcAccessor.java:99)
at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:413)
at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:468)
at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:478)
at org.springframework.boot.actuate.health.DataSourceHealthIndicator.doDataSourceHealthCheck(DataSourceHealthIndicator.java:98)
at org.springframework.boot.actuate.health.DataSourceHealthIndicator.doHealthCheck(DataSourceHealthIndicator.java:87)
at org.springframework.boot.actuate.health.AbstractHealthIndicator.health(AbstractHealthIndicator.java:38)
at org.springframework.boot.actuate.endpoint.HealthEndpoint.invoke(HealthEndpoint.java:67)
at org.springframework.boot.actuate.endpoint.HealthEndpoint.invoke(HealthEndpoint.java:34)
at org.springframework.boot.actuate.endpoint.mvc.HealthMvcEndpoint.invoke(HealthMvcEndpoint.java:102)
at sun.reflect.GeneratedMethodAccessor78.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:215)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:749)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:689)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:938)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:870)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:961)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:852)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:687)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:769)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1667)
at org.springframework.boot.actuate.trace.WebRequestTraceFilter.doFilterInternal(WebRequestTraceFilter.java:110)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1650)
at org.springframework.boot.actuate.autoconfigure.EndpointWebMvcAutoConfiguration$ApplicationContextHeaderFilter.doFilterInternal(EndpointWebMvcAutoConfiguration.java:280)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1650)
at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:186)
at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:160)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1650)
at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1650)
at onlinevalidation.CorsFilter.doFilter(CorsFilter.java:20)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1650)
at org.springframework.boot.actuate.autoconfigure.MetricFilterAutoConfiguration$MetricsFilter.doFilterInternal(MetricFilterAutoConfiguration.java:90)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1650)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:583)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:577)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1125)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1059)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
at org.eclipse.jetty.server.Server.handle(Server.java:497)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:311)
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:248)
at org.eclipse.jetty.io.AbstractConnection.run(AbstractConnection.java:540)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:610)
at org.eclipse.jetty.util.thread.QueuedThreadPool.run(QueuedThreadPool.java:539)
at java.lang.Thread.run(Thread.java:745)
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: No operations allowed after connection closed.
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:408)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:377)
at com.mysql.jdbc.Util.getInstance(Util.java:360)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:956)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:935)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:924)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:870)
at com.mysql.jdbc.ConnectionImpl.throwConnectionClosedException(ConnectionImpl.java:1232)
at com.mysql.jdbc.ConnectionImpl.checkClosed(ConnectionImpl.java:1225)
at com.mysql.jdbc.ConnectionImpl.getMetaData(ConnectionImpl.java:2932)
at com.mysql.jdbc.ConnectionImpl.getMetaData(ConnectionImpl.java:2927)
at sun.reflect.GeneratedMethodAccessor76.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at org.apache.tomcat.jdbc.pool.ProxyConnection.invoke(ProxyConnection.java:126)
at org.apache.tomcat.jdbc.pool.JdbcInterceptor.invoke(JdbcInterceptor.java:109)
at org.apache.tomcat.jdbc.pool.DisposableConnectionFacade.invoke(DisposableConnectionFacade.java:80)
at com.sun.proxy.$Proxy68.getMetaData(Unknown Source)
at org.springframework.jdbc.support.JdbcUtils.extractDatabaseMetaData(JdbcUtils.java:285)
... 66 common frames omitted
Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet successfully received from the server was 758,805 milliseconds ago. The last packet sent successfully to the server was 37 milliseconds ago.
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:408)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:377)
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1036)
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3427)
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3327)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3814)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2435)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2582)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2526)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2484)
at com.mysql.jdbc.StatementImpl.executeQuery(StatementImpl.java:1446)
at org.springframework.jdbc.core.JdbcTemplateQueryStatementCallback.doInStatement(JdbcTemplate.java:452)
at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:402)
... 60 common frames omitted
Caused by: java.io.EOFException: Can not read response from server. Expected to read 4 bytes, read 0 bytes before connection was unexpectedly lost.
at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:2914)
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3337)
... 69 common frames omitted
@Configuration
@ComponentScan(value = "com.demo.validation",scopedProxy = TARGET_CLASS)
@EnableAutoConfiguration
@EnableAspectJAutoProxy(proxyTargetClass = true)
@EnableCaching(proxyTargetClass = true)
@EnableAsync(proxyTargetClass = true)
@EnableJpaRepositories
@EnableTransactionManagement(proxyTargetClass = true)
public class Configuration {
main(...)
}
配置
spring.datasource.url=jdbc:mysql://localhost/validation
spring.datasource.username=validation
spring.datasource.password=****
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
Gradle.Build
dependencies {
//Boot
compile 'org.codehaus.groovy:groovy-all:2.3.7:indy'
compile 'org.springframework.boot:spring-boot-starter-actuator:1.1.8.RELEASE'
compile 'org.springframework.boot:spring-boot-starter-security:1.1.8.RELEASE'
compile 'org.springframework:spring-aspects:4.0.7.RELEASE'
compile 'org.springframework.boot:spring-boot-starter-aop:1.1.8.RELEASE'
compile 'org.springframework:spring-instrument:4.0.7.RELEASE'
compile('org.springframework.boot:spring-boot-starter-web:1.1.8.RELEASE'){
exclude module: 'spring-boot-starter-tomcat'
}
//servlet container
compile 'org.eclipse.jetty:jetty-webapp:9.2.3.v20140905'
compile 'org.eclipse.jetty:jetty-servlets:9.2.3.v20140905'
//DB
compile 'org.springframework.boot:spring-boot-starter-data-jpa:1.1.8.RELEASE'
compile 'mysql:mysql-connector-java:5.1.34'
//compile 'org.mariadb.jdbc:mariadb-java-client:1.1.8'
runtime 'com.h2database:h2:1.4.182'
尝试将您的连接 URL 更改为：
spring.datasource.url=jdbc:mysql://localhost/validation?autoReconnect=true
根据 Spring forums 中的一位高级成员，Spring DataSource 不适用于生产用途：
The above answers are only part of the solution. Indeed you need
proper transaction managent AND you need a connection pool. The
DriverManagerDataSource is NOT meant for production, it opens and
closes a datebase connection each time it needs one.
相反，您可以使用 C3P0 作为您的数据源，它处理重新连接并且性能更好。这是 Spring xml 配置中潜在配置的快速示例：
<bean id="c3p0DataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
destroy-method="close">
<property name="driverClass" value="com.mysql.jdbc.Driver" />
<property name="jdbcUrl" value="#{systemProperties.dbhost}" />
<property name="user" value="#{systemProperties.dbuser}" />
<property name="password" value="#{systemProperties.dbpass}" />
<property name="maxPoolSize" value="25" />
<property name="minPoolSize" value="10" />
<property name="maxStatements" value="100" />
<property name="testConnectionOnCheckout" value="true" />
</bean>
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
<constructor-arg ref="c3p0DataSource" />
</bean>
Spring（3）hibernate和oracle的启动设置：
spring.datasource.test-on-borrow=true
spring.datasource.validation-query=select 1 来自 dual
为了详细说明@user5101998 的答案并更新其他答案，autoReconnect 实际上 不推荐 。来自 the connector documentation:
The use of this feature is not recommended, because it has side effects related to session state and data consistency when applications don't handle SQLExceptions properly, and is only designed to be used when you are unable to configure your application to handle SQLExceptions resulting from dead and stale connections properly
test-on-borrow 属性 使您的提供者（Tomcat、Hikari 等）在从连接池获取连接之前测试连接是否有效。
validate-query 将用于确保连接有效。
使用这些参数可以防止 Spring 使用死连接。例如，对于 Tomcat，您可以找到有关这些参数的文档 here。
我在与 Maria DB 相同的主机上有一个 spring-boot 应用程序，两者都 运行 一段时间没问题。但是在 12 小时到 2 天之间，spring 启动应用程序似乎失去了与数据库（堆栈跟踪）的连接并且无法从中恢复。
当我重新启动 spring 应用程序时，一段时间内一切正常。
应用程序没有负载，当它失去连接时，应用程序仍在工作，但数据库连接没有恢复。数据库没有同时重启（正常运行时间 4 周）。只有监控服务每分钟 ping 一次 ping 数据库的应用程序。 （spring 启动运行状况）
连接到同一数据库的其他 Java 应用程序 运行 正常，没有任何问题。
我的问题是：
为什么 spring 没有从该错误中恢复并再次尝试重新连接到数据库？如何设置 spring 以重新连接到数据库？
2015-02-19 15:25:48.392 INFO 4931 [qtp92662861-19] --- o.s.b.f.xml.XmlBeanDefinitionReader : Loading XML bean definitions from class path resource [org/springframework/jdbc/support/sql-error-codes.xml]
2015-02-19 15:25:48.580 INFO 4931 [qtp92662861-19] --- o.s.jdbc.support.SQLErrorCodesFactory : SQLErrorCodes loaded: [DB2, Derby, H2, HSQL, Informix, MS-SQL, MySQL, Oracle, PostgreSQL, Sybase]
2015-02-19 15:25:48.616 WARN 4931 [qtp92662861-19] --- o.s.jdbc.support.SQLErrorCodesFactory : Error while extracting database product name - falling back to empty error codes
org.springframework.jdbc.support.MetaDataAccessException: Error while extracting DatabaseMetaData; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: No operations allowed after connection closed.
at org.springframework.jdbc.support.JdbcUtils.extractDatabaseMetaData(JdbcUtils.java:296)
at org.springframework.jdbc.support.JdbcUtils.extractDatabaseMetaData(JdbcUtils.java:320)
at org.springframework.jdbc.support.SQLErrorCodesFactory.getErrorCodes(SQLErrorCodesFactory.java:214)
at org.springframework.jdbc.support.SQLErrorCodeSQLExceptionTranslator.setDataSource(SQLErrorCodeSQLExceptionTranslator.java:134)
at org.springframework.jdbc.support.SQLErrorCodeSQLExceptionTranslator.<init>(SQLErrorCodeSQLExceptionTranslator.java:97)
at org.springframework.jdbc.support.JdbcAccessor.getExceptionTranslator(JdbcAccessor.java:99)
at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:413)
at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:468)
at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:478)
at org.springframework.boot.actuate.health.DataSourceHealthIndicator.doDataSourceHealthCheck(DataSourceHealthIndicator.java:98)
at org.springframework.boot.actuate.health.DataSourceHealthIndicator.doHealthCheck(DataSourceHealthIndicator.java:87)
at org.springframework.boot.actuate.health.AbstractHealthIndicator.health(AbstractHealthIndicator.java:38)
at org.springframework.boot.actuate.endpoint.HealthEndpoint.invoke(HealthEndpoint.java:67)
at org.springframework.boot.actuate.endpoint.HealthEndpoint.invoke(HealthEndpoint.java:34)
at org.springframework.boot.actuate.endpoint.mvc.HealthMvcEndpoint.invoke(HealthMvcEndpoint.java:102)
at sun.reflect.GeneratedMethodAccessor78.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:215)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:749)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:689)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:938)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:870)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:961)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:852)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:687)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:769)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1667)
at org.springframework.boot.actuate.trace.WebRequestTraceFilter.doFilterInternal(WebRequestTraceFilter.java:110)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1650)
at org.springframework.boot.actuate.autoconfigure.EndpointWebMvcAutoConfiguration$ApplicationContextHeaderFilter.doFilterInternal(EndpointWebMvcAutoConfiguration.java:280)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1650)
at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:186)
at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:160)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1650)
at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1650)
at onlinevalidation.CorsFilter.doFilter(CorsFilter.java:20)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1650)
at org.springframework.boot.actuate.autoconfigure.MetricFilterAutoConfiguration$MetricsFilter.doFilterInternal(MetricFilterAutoConfiguration.java:90)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1650)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:583)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:577)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1125)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1059)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
at org.eclipse.jetty.server.Server.handle(Server.java:497)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:311)
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:248)
at org.eclipse.jetty.io.AbstractConnection.run(AbstractConnection.java:540)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:610)
at org.eclipse.jetty.util.thread.QueuedThreadPool.run(QueuedThreadPool.java:539)
at java.lang.Thread.run(Thread.java:745)
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: No operations allowed after connection closed.
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:408)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:377)
at com.mysql.jdbc.Util.getInstance(Util.java:360)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:956)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:935)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:924)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:870)
at com.mysql.jdbc.ConnectionImpl.throwConnectionClosedException(ConnectionImpl.java:1232)
at com.mysql.jdbc.ConnectionImpl.checkClosed(ConnectionImpl.java:1225)
at com.mysql.jdbc.ConnectionImpl.getMetaData(ConnectionImpl.java:2932)
at com.mysql.jdbc.ConnectionImpl.getMetaData(ConnectionImpl.java:2927)
at sun.reflect.GeneratedMethodAccessor76.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at org.apache.tomcat.jdbc.pool.ProxyConnection.invoke(ProxyConnection.java:126)
at org.apache.tomcat.jdbc.pool.JdbcInterceptor.invoke(JdbcInterceptor.java:109)
at org.apache.tomcat.jdbc.pool.DisposableConnectionFacade.invoke(DisposableConnectionFacade.java:80)
at com.sun.proxy.$Proxy68.getMetaData(Unknown Source)
at org.springframework.jdbc.support.JdbcUtils.extractDatabaseMetaData(JdbcUtils.java:285)
... 66 common frames omitted
Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet successfully received from the server was 758,805 milliseconds ago. The last packet sent successfully to the server was 37 milliseconds ago.
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:408)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:377)
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1036)
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3427)
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3327)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3814)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2435)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2582)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2526)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2484)
at com.mysql.jdbc.StatementImpl.executeQuery(StatementImpl.java:1446)
at org.springframework.jdbc.core.JdbcTemplateQueryStatementCallback.doInStatement(JdbcTemplate.java:452)
at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:402)
... 60 common frames omitted
Caused by: java.io.EOFException: Can not read response from server. Expected to read 4 bytes, read 0 bytes before connection was unexpectedly lost.
at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:2914)
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3337)
... 69 common frames omitted
@Configuration
@ComponentScan(value = "com.demo.validation",scopedProxy = TARGET_CLASS)
@EnableAutoConfiguration
@EnableAspectJAutoProxy(proxyTargetClass = true)
@EnableCaching(proxyTargetClass = true)
@EnableAsync(proxyTargetClass = true)
@EnableJpaRepositories
@EnableTransactionManagement(proxyTargetClass = true)
public class Configuration {
main(...)
}
配置
spring.datasource.url=jdbc:mysql://localhost/validation
spring.datasource.username=validation
spring.datasource.password=****
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
Gradle.Build
dependencies {
//Boot
compile 'org.codehaus.groovy:groovy-all:2.3.7:indy'
compile 'org.springframework.boot:spring-boot-starter-actuator:1.1.8.RELEASE'
compile 'org.springframework.boot:spring-boot-starter-security:1.1.8.RELEASE'
compile 'org.springframework:spring-aspects:4.0.7.RELEASE'
compile 'org.springframework.boot:spring-boot-starter-aop:1.1.8.RELEASE'
compile 'org.springframework:spring-instrument:4.0.7.RELEASE'
compile('org.springframework.boot:spring-boot-starter-web:1.1.8.RELEASE'){
exclude module: 'spring-boot-starter-tomcat'
}
//servlet container
compile 'org.eclipse.jetty:jetty-webapp:9.2.3.v20140905'
compile 'org.eclipse.jetty:jetty-servlets:9.2.3.v20140905'
//DB
compile 'org.springframework.boot:spring-boot-starter-data-jpa:1.1.8.RELEASE'
compile 'mysql:mysql-connector-java:5.1.34'
//compile 'org.mariadb.jdbc:mariadb-java-client:1.1.8'
runtime 'com.h2database:h2:1.4.182'
尝试将您的连接 URL 更改为：
spring.datasource.url=jdbc:mysql://localhost/validation?autoReconnect=true
根据 Spring forums 中的一位高级成员，Spring DataSource 不适用于生产用途：
The above answers are only part of the solution. Indeed you need proper transaction managent AND you need a connection pool. The DriverManagerDataSource is NOT meant for production, it opens and closes a datebase connection each time it needs one.
相反，您可以使用 C3P0 作为您的数据源，它处理重新连接并且性能更好。这是 Spring xml 配置中潜在配置的快速示例：
<bean id="c3p0DataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
destroy-method="close">
<property name="driverClass" value="com.mysql.jdbc.Driver" />
<property name="jdbcUrl" value="#{systemProperties.dbhost}" />
<property name="user" value="#{systemProperties.dbuser}" />
<property name="password" value="#{systemProperties.dbpass}" />
<property name="maxPoolSize" value="25" />
<property name="minPoolSize" value="10" />
<property name="maxStatements" value="100" />
<property name="testConnectionOnCheckout" value="true" />
</bean>
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
<constructor-arg ref="c3p0DataSource" />
</bean>
Spring（3）hibernate和oracle的启动设置：
spring.datasource.test-on-borrow=true
spring.datasource.validation-query=select 1 来自 dual
为了详细说明@user5101998 的答案并更新其他答案，autoReconnect 实际上 不推荐 。来自 the connector documentation:
The use of this feature is not recommended, because it has side effects related to session state and data consistency when applications don't handle SQLExceptions properly, and is only designed to be used when you are unable to configure your application to handle SQLExceptions resulting from dead and stale connections properly
test-on-borrow 属性 使您的提供者（Tomcat、Hikari 等）在从连接池获取连接之前测试连接是否有效。
validate-query 将用于确保连接有效。
使用这些参数可以防止 Spring 使用死连接。例如，对于 Tomcat，您可以找到有关这些参数的文档 here。